Phenology studies can be appliedin sustainable management, protection, rehabilitation, development, and utilization of forest resources. In this study, the phenology of Persian oak was investigated in three forested areas of Mamasani, Dasht-e-Arjan and Kamfirouz with 2300 m,2100 m,1800 m altitude, respectively in south –west and north of Fars province, Iran. In each area, ninetrees were visited repeatedlyat different times in different seasons during 5 years (1998-2002) and the observed characteristics were recorded. The results showed the stages of growth were completely different at the threementioned areas. The shoots sprouted up in the second week of March to the first week of April. The full leaf formation happened in the second week of April to the fourth week of April. The early flowers appeared in the second week of March to the fourth week April. Pollination occurred in the third week of March to the third week in April. The leaves began to fall in the fourth week of October to the fourth week of December. So characteristics of phenology in Persian oak were affected by climate and environmental factors.
